function s1_hello(){
echo "hello, world!"
}
function s2_tell_who_i_am(){
 whoami
}
function s3_which_distro_do_i_use(){
grep '^NAME=' /etc/*-release | awk -F '"' '{printf "NAME=\""$2"\""}'
}
function s4_view_my_cpu_arch(){
uname -m
}
function s5_show_first_scsi_disk_size(){
lsblk -l |grep disk |grep '^sda'| awk '{match($4, /[0-9]+/,arr);print arr[0]}'
}
function s6_show_main_memory_size_in_megabytes(){
free -m |awk '/Mem:/ {print $2}'
}
